Heavyweight sluggers Shane Carwin and Roy ‘Big Country’ Nelson have been announced as coaches for the next installment of The Ultimate Fighter.

The show’s second season on FX will begin airing in September and will feature 32 welterweights vying for a TUF title and a UFC contract.

“This is going to be a very interesting dynamic between these two,” says UFC president Dana White.

“They both have huge punching power and great chins but, outside of the Octagon, they couldn’t be more different.”

The muscled-up, soft spoken Carwin is one of the few UFC fighters at his level that still retains a day job as a mechanical engineer.

Nelson — who rubs his ample belly after fights and claims to represent the ‘Average Joe’ is a black belt jiu-jitsu practitioner and a full-time fighter.

Following the announcement, Carwin took to twitter to question Nelson’s ‘everyman’ character saying: “Roy said he was going to win for the "avg joe". Yet my coaches and I are the ones taking leave of absences from our jobs.”

White says he expects heated exchanges between the two — who will fight at the show’s finale in December — before and during the program.

“These two have been going at it on social media for a while and don’t seem to like each other very much, but they are going to be seeing a lot of each other during this series,” says White.

The 12-2 Carwin — a former NCAA Division II champion — is healthy following back surgery.

“I’m very excited to get this opportunity. Coaching TUF is something I asked for and really wanted to do,” said Carwin.

“I also asked to coach against Roy Nelson. The fans know how I like to conduct myself both in and out of the Octagon, and I respect every fighter, coach, official and fan in the UFC. But I cannot respect a man like Roy Nelson - because he shows no respect himself. He is a keyboard warrior who doesn’t have the guts to talk trash to my face, but now he’s going to have to be in the same room, the same gym and finally the same Octagon as me.

“I know I am a better fighter and trainer than he is. I will prove I’m a better trainer in TUF and then, when we fight, I will hit him harder than anyone has ever hit him and teach him some respect.”

“When I found out I was going to be a TUF coach I was like ‘Wow me!’ When I found out I was coaching against Shane Carwin I was so happy to get a chance to compete against this guy,” says Nelson.

“As for being in the same room as him, I try not hang out with people that make me feel icky on the inside but, to coach TUF, I will make an exception.

"Shane Carwin can think he is the better fighter and coach, but I will do my best and try to represent the Average Joe and show my team that, with hard work, you can walk away a winner against any fighter."